Coating evaluation of polydimethylsiloxane-aminopropylsiloxane for stir bar sorptive extraction

In stir bar sorptive extraction (SBSE), a coating is typically used to isolate and preconcentrate organic compounds in aqueous samples. Here, a translucent coating based on polydimethylsiloxane and aminopropyltriethoxysilane was prepared by a sol–gel method. Characterization tests showed that the coating was homogeneous, relatively polar, and both thermally (≤ 400°C) and chemically stable. Coated stir bars were evaluated in SBSE experiments. Benzene derivatives and furanic compounds were successfully extracted/preconcentrated from aqueous and organic solutions. Furanic compounds and benzene derivatives were moderately extracted from water, but they were sufficiently extracted from isooctane.